Finding the Fourth Proportional to 1,118.72, 1,678.17 and 460.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.72 : 1,678.17 = 460.44 : x
2. Step 2: Convert to fraction form
   1,118.72/1,678.17 = 460.44/x
3. Step 3: Cross multiply
   1,118.72x = 1,678.17 × 460.44
4. Step 4: Simplify right side
   1,118.72x = 772,696.59
5. Step 5: Solve for x
   x = 772,696.59/1,118.72
6. Step 6: Final answer
   x = 690.70